smith is 11 weeks pregnant with her second child. >> i feel great. a lot of energy. it's just been a wonderful experience. >> reporter: she takes a prenatal multivitamin, with folic acid. a new study looked at 85,000 children in norway. researchers found mothers who took folic acid supplements before they conceived and during the first two months of their pregnancy, lowered their child's chances of autism 30%. >> will lead to new ways to prevent ought iistic disorders. >> reporter: it is already known to reduce the risk of spine -- brain and spine birth defects. >> is not costly. approximate is part of the standard of care, ridiculous. so we would televisionally recommend it. >> reporter: doctors recommend that pregnant women and women trying to get pregnant, take 400 grams of folic acid a day. that's the typical amount in folic acid. >> we put a lot of focus on healthiness, being healthy, taking the right vitamins, eating well. >> reporter: she's also trying to cut -- get more sleep and cut down on stress to make sure she has a healthy baby.